package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.IdWorker;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.entity.OrderDetail;
import com.itheima.reggie.entity.Orders;
import com.itheima.reggie.service.OrderDetailService;
import com.itheima.reggie.service.OrderService;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.mapper.OrderMapper;
import com.itheima.reggie.entity.*;
import com.itheima.reggie.service.*;
import com.itheima.reggie.entity.ShoppingCart;
import com.itheima.reggie.service.ShoppingCartService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.stream.Collectors;

/**
 * @author jay
 */
@Service
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Orders> implements OrderService {
    @Autowired
    private ShoppingCartService shoppingCartService;
    @Autowired
    private UserService userService;
    @Autowired
    private AddressBookService addressBookService;
    @Autowired
    private OrderDetailService orderDetailService;
    /**
     * 用户下单
     * @param orders
     */
    @Transactional
    public void submit(Orders orders) {
        //获得当前用户id
        Long userId = BaseContext.getCurrentId();
        //查询当前用户的购物车数据
        LambdaQueryWrapper<ShoppingCart> shoppingCarWrapper = new LambdaQueryWrapper<>();
        shoppingCarWrapper.eq(ShoppingCart::getUserId,userId);
        List<ShoppingCart> shoppingCarts = shoppingCartService.list(shoppingCarWrapper);
        if(shoppingCarts == null || shoppingCarts.size() == 0){
            throw new CustomException("用户购物车为空，不能下单");
        }
        //查询用户数据
        User user = userService.getById(userId);
        //查询地址信息
        Long addressBookId = orders.getAddressBookId();
        AddressBook addressBook = addressBookService.getById(addressBookId);
        if(addressBook == null){
            throw new CustomException("用户地址信息有误，不能下单");
        }

        //向订单插入数据，一条数据
        long orderId = IdWorker.getId(); //订单号
        //为什么用到AtomicInteger是因为其原子性,是原子多线程int基本数据类型操作中不会出现多线程赋值失败错误
        AtomicInteger amount = new AtomicInteger(0);
        //向订单明细表的各个属性赋值
        List<OrderDetail> orderDetails = shoppingCarts.stream().map((item) -> {
            OrderDetail orderDetail = new OrderDetail();
            orderDetail.setOrderId(orderId);
            orderDetail.setNumber(item.getNumber());
            orderDetail.setDishFlavor(item.getDishFlavor());
            orderDetail.setDishId(item.getDishId());
            orderDetail.setSetmealId(item.getSetmealId());
            orderDetail.setName(item.getName());
            orderDetail.setImage(item.getImage());
            orderDetail.setAmount(item.getAmount());
            //addAndGet == `+=`  累加价格
            //multiply方法 == 金额amount * 份数new BigDecimal(item.getNumber()
            amount.addAndGet(item.getAmount().multiply(new BigDecimal(item.getNumber())).intValue());
            return orderDetail;
        }).collect(Collectors.toList());
        //向orders的各个数据赋值
        orders.setId(orderId);
        orders.setOrderTime(LocalDateTime.now());
        orders.setCheckoutTime(LocalDateTime.now());
        orders.setStatus(2);
        orders.setAmount(new BigDecimal(amount.get()));//总金额
        orders.setUserId(userId);
        orders.setNumber(String.valueOf(orderId));
        orders.setUserName(user.getName());
        orders.setConsignee(addressBook.getConsignee());
        orders.setPhone(addressBook.getPhone());
        orders.setAddress((addressBook.getProvinceName() == null ? "" : addressBook.getProvinceName())
                + (addressBook.getCityName() == null ? "" : addressBook.getCityName())
                + (addressBook.getDistrictName() == null ? "" : addressBook.getDistrictName())
                + (addressBook.getDetail() == null ? "" : addressBook.getDetail()));
        this.save(orders);

        //向订单明细表插入数据，多条数据
        orderDetailService.saveBatch(orderDetails);
        //清空购物车数据
        shoppingCartService.remove(shoppingCarWrapper);
    }
}
